As of 5 p.m. Friday, Sinema has 991,189 votes statewide, while McSally has 970,986.

RESULTS: Track AZ election results here

About 362,000 votes remain uncounted across the state of Arizona as of Friday evening, according to the Secretary of State's office.

It is one of the most-watched races across the country: will Martha McSally, a Republican, or Kyrsten Sinema, a Democrat, serve as Arizona's first female senator?

Both are vying to fill Sen. Jeff Flake's seat after Flake's announcement in 2017 that he would not seek re-election.